The development in the field of psychology has been through many decades. there has been a revolution the advancement of psychological field. 
The understanding of human behavior have resulted in solving many problems. It mainly focuses on how a human will respond in a certain situation and what will be his behavior based on the environment. 
There are many books published by various authors which include Sigmund Freud's Interpretation of Dreams.
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Answer:
1830-1860. Have a nice day :-)
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Answer: I think the answer is "It weakened attempts to abolish slavery."
 
        
             
        
        
        
 think its the united states tariff policies  favored northern manufacturers and harmed